Explosive bullet



Dec. 12, 1944.

- R. N. NELSON r 2,364,646

EXPLOS IVE BULLET Filed Aug. 18, 1941 Richard N Nelscm Patented Dec. 12,1944 UNITED STATES PATENT OFFIE EXPLOSIVE BULLET Richard N. Nelson,Black River Falls, Wis.

Application August 18, 1941, Serial No. 407,298

(Granted under the act of March -3, 1883, as amended April 3-0, 1928;370 0. G. 757) 4 Claims.

The invention described herein may be manufactured and used by or forthe Government for governmental purposes, without the payment to me ofany royalty thereon.

This invention relates to explosive or incendiary bullets and moreparticularly to percussion igniting means for such bullets.

,It is an object of this invention to produce igniting means whichalthough simple in operation and having a minimum number of parts willbe safe in storage and in handling.

It is a further object of this invention to produce igniting means whichcan be readily assembled for use in small arms ammunition.

The specific nature of the invention as well as other objects andadvantages thereof will clearly appear from a description of a preferredembodiment as shown in the accompanying drawing in which:

Figure l is a longitudinal section of a portion of a bullet embodying myinvention.

Figure 2 is a cross section taken on the line 2-2 of Fig. 1.

In my invention as shown in Figure 1, the jacket I, which may be made ofgilding or other suitable metal is formed with a nose section 2 and abase section 3. Similarly the core 4 preferably of steel is formed witha hollow nose section 5 and a similar base section 6. A circumferentialgroove 1 having a rearwardly facing shoulder is formed in the outersurface of the core section 5. The core sections are filled with themain charge 8 such as tetryl, and between the ends of the core sectionsan annulus 9 of primer compound, such as fulminate of mercury or asuitable azide, and a washer ll] of a solid material, such as Woodsmetal having a low degree of resistance to heat are inserted. The frontend of the rear core section 6 has a short section II of reduceddiameter. The sections of the core are inserted in the sections of thejacket and the ends of the jacket sections are crimped into the groove7. Connecting the rear or driving section of the jacket to the frontsection of the core insures that the rear section of the jacket willsupport the front section of the core against setback and serve totransmit the driving force to the core without crushing the primingcharge. If the rear jacket section is brought forward far enough toinclude all of the barrel engaging section of the projectile the forwardjacket section may be dispensed with.

Upon firing the heat of the explosion and of friction will be sufficientto soften the material of the washer In to a degree sufiicient to permitcentrifugal force to displace the material to a position opposite thereduced portion ll of the rear core section. Upon impact the rearsection of the core will be free to move forward crushing the primeragainst the front core section to fire it and initiate the main charge.

I claim:

1. A bullet comprising front and rear hollow core sections in spacedrelation, the front section having an exterior circumferential groovepresenting a rearwardly facing shoulder, a main charge in said coresections, a jacket surrounding the core sections and comprising a frontsection having an inturned flange at its rear end in engagement withsaid shoulder, and a rear jacket section whose forward end occupies aportion of said groove and lies in abutting relation with the flange ofthe front jacket section, a priming charge between the core sections,and fusible means melted in the firing of a gun between said coresections and retaining them normally in spaced relation until afterfiring.

2. A bullet comprising a front hollow substantially cylindrical coresection, saidfront section having an exterior circumferential groovepresenting a rearwardly facing shoulder and having an open rear end, arear hollow core section having an open front end opposed to and spacedfrom the rear end of the front section, a main charge in said coresections, an annular priming charge between the core sections, a ring offusible material melted in the firing of a gun surrounding the primingcharge and the main charge for maintaining the core sections normally insaid spaced relation until after firing, a jacket for the core sectionscomprising front and rear sections, the front jacket section having aninturned flange at its rear end engaging the shoulder of saidcircumferential groove, and a rear jacket section in abutting relationwith the flange of the front section.

3. A bullet comprising cylindrical front and rear core sections spacedfrom the other and having axially aligned communicating chambers, thefront core section having an exterior circumferential groove presentinga rearwardly facing shoulder, a unitary main charge in said chambers, anannular priming pellet surrounding the main charge and in the spacebetween the core sections, a ring of fusible material melted in thefiring of a gun surrounding the said pellet and normally maintaining thecore sections in said spaced relation until after firing, a jacket forthe core sections comprising a front section having an inturned flangeat its rear end and in the front core section being provided with anexterior circumferential groove presenting a rearwardly facing shoulder,a jacket for said core sections comprising a front section having aninturned flange at its rear end in contact with said shoulder, and arear jacket section having its front end portion connected with thefront core section and occupying a portion of said circumferentialgroove and in abutting relation with the 10 flange of the front jacketsection.

RICHARD N. NELSON.

